【ABAQUS模态动力学】Material-Damping 对模态分析的影响
先说结论,执行Frequency Step (特征值提取)时定义材料行为中的Damping 行为,对结果没有影响。
1. abaqus calculation compare
1.1 ANALYSIS OBJECT
1.2 PRE-PROCESS
- Property
- MATERIAL-1
- density:1600 Kg/m^3
- Structural Damping: 0.05
- Young's modulus: 210 GPa
- Poisson's ratio : 0.3
- Section define
- type: Solid, Homogenous
- material:MATERIAL-1
- Assign Section
- assign MATERIAL-1 for Part-1
- MATERIAL-1
- Assembly
- create independent instance
- The rest default
- Step
- create a Frequency step
- turn off Nlgeom option
- choose lanczos EIGENVALUE_SOLVER
- extract the first 10 modes and the rest set default
- Output Request
- field output:U , S , E
- history output:None
- create a Frequency step
- Interaction
- NONE
- Load
- Cantilever Beam Displacement Boundary Condition: Constrains all degrees of freedom on one surface.
- load: None
- Mesh
- global Seed: 2
- Mesh control: default(HEX,structual)
- Element type: default(C3D8R)
- job
- create job-1
- The rest default
1.3 Post-PROCESS
1.3.1 Analysis results(including structural damping parameters)
1.3.2 Analysis results( delete structural damping parameters)
1.3.3 Conclusion
对比两种情况的下的特征值和特征频率求解结果,可见abaqus frequency分析步计算时阻尼参数对计算结果没有影响,因为求的是无阻尼固有频率
。
3. 参考资料
- abaqus help document 2020
- 《结构动力学》
本文来自博客园,作者:FE-有限元鹰,转载请注明原文链接:https://www.cnblogs.com/aksoam/p/17031279.html